Automatic draft regulator for boilers



Dec. 1 1, 1928.

A. M. MERTZANOFF AUTOMATIC DRAFT REGULATOR FOR BOILERS Original Filed Feb. 27, 1925 2 sh t s 1 1 awwemtoz Dec. 11, 1928; 1,695,240

' A. M. MERTZANOFF AUTOMATIC DRAFT REGULATOR FOR BOILERS Original Filed Feb. 27, 1923 2 Sheets-Sheet 2 HTTOR/VE) Patented Dec. 11, 1928.

UNITED STATES ANDRE M. MERTZANOFF, OF NEW YORK, N. Y., ASSIGNOR TO AMERICAN RADIATOR f 4 1,695,240 PATENT OFFICE.

COMPANY, OF NEW YORK, N Y., A CORPORATION OF NEW JERSEY.

- AUTOMATIC DRAFT REGULATOR FOR BOILERS.

Application filed February 27, 1923, Serial No. 621,518. Renewed November 9, 1928.

My invention relates to improvements in heating apparatus, and the same has forits object more particularly to provide a simple, compact and efficient device for controlling the rate of fuel consumption in a'boiler or analogous structure.

Further, said invention has for its object to provide means for controlling the damper of a boiler or the like in order to insure an even, uniform draft therethrough.

Further, said invention has for its object to provide means for controlling the damper of a boiler or the like, which means is automatically responsive to changes and conditions within the boiler, whereby to control the draft therethrough.

Further, said invention has for its object to provide means for controlling the damper of a boiler or the like by means of which, if so desired, an air-tight closure may be formed when the damper is actuated to close the opening associated therewith.

Further, said invention has for its object to provide means for controlling the damper of a boiler or the like in order to automatically control the operation of the damper to regulate the draft thereto, and in which said automatic means is rendered inoperative, and the damper locked in its closed position.

Other objects will in part be obvious and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends my invention consists in the novel details of construction, and in the combination, connection and arrangement of parts hereinafter more fully described and then pointed out in the claims.

Figure 1 is a side view, partly broken away and in section showing aboiler with one form of regulator constructed according to and embodying my said inventionapplied thereto;

Fig. 2 is a face view of the draft regulator with the protective cover therefor;

Fig. 3 is an enlarged central sectional view showing'a portion of a boiler and the draft regulator therefor, and

Fig. 4 is a face view of the regulator with the protective cover removed therefrom.

In said drawings, 10 designates a combined boiler and heater comprising a hollow front section 11, a hollow back section'12, and a plurality of substantially loop-shaped intermediate sections 13. The front section 11 is provided Withthe usual fuel opening having the ash-pit of the boiler.

a door 13, a slicing opening having a door 3 14, an ash pit opening having a door 15, and adjacent to its top with a flue opening provided with a door 16.

Within the boiler, between the front and back sections 11 and 12 are arranged a plurality of grate bars 17 which are arranged side by side and longitudinally of the boiler. 18 denotes the smoke outlet provided at the upper rear end of the boiler. In the back section 12, adjacent to the bottom of the boiler, is provided a cold air inlet opening 19 which communicates with the interior of the boiler below the grate 17. The inner end of the opening 19 is provided with a hood or guard 20 to prevent the entrance of ash or other matter into said opening 19, and-atthe outer end said opening. is provided with a rib 21 having a ground outer surface 21.

The back section 12 of the heating apparatus is provided above the inlet opening 19 with an aperture 22 having a peripheral rib 22'" provided with a ground outer surface 22?.

Within said opening 22, is fitted a thermostatic or pressure sensitive element in the form of a collapsible-expansible metallic bellows 23 provided at its inner end with a relatively thick closed end23 and at its outer end with a relatively thick laterally-extending flange 23, adapted to bear against the ground surface 22 of the rib 22 24 denotes a plate having ears 25 to receive screws 26 whereby said plate is securedin place over the aperture 22 with its inner recessed surface bearing against the outer surface of the flange 23 of the metallic bel lows 23. The plate 24: is also provided with a centralaperture, through which extends a stem 27 provided at its inner end with an enlarged head 28 secured to the inner side of the end 23 by a screw 29. The outer end of the stem 27 extends through the disc or plate 24 and is pivotally connected to the upper end of an operating lever 31 which is pivotally supported adjacent to'its upper end in bearings 32 carried by the disc or plate 24-. To the lower end of said lever 31 is pivotally V secured a circular plate or disc 33 whose inner side is partly recessed andwhose periphery forms a valve face which is adapted to seat upon the ground surface 21 ofthe rib 21' surrounding the opening 19, in the back section 12, which opening 19 communicates with The said plate or disc 33 may be provided with a small aperture 42, to permit of the passage of a small quantity or air at all times.

3O denotes a coil spring disposed about the stem 2'? and having its ends bearing against the plate as and the head 28 of the stem 27 whereby to maintain the metallic bellows 23 normally expanded.

By preference the inner lower end of the lever 31 is arranged at an angle to the longitudinal axis of the lever so that the valve plate or disc 33 will. seat properl over its entire surface against its seat formed by the rib 21 when said plate 33 moved inwardly against said seat by the action of the lever 31 and metallic bellows 28.

ea denotes a shaft, supported in bearings 35,.and to one outer end of said shaft is secured a lever 86, provided with an enlarged head 3? serving as a counter-weight.

38denotes an arm, secured upon the shaft 34 midway of its ends, and which is adapted to engage with the outer side ot' the lever 31 adjacent to its lower end in order to hold the disc 33 locked-in place to close the opening 19.

The plate 33 is maintained normally unseated by the spring 80 which surrounds the stem 27 ot the collapsibleeapansible element- 23.

In order to protect the regulator and its associated operating parts, the same are enclosed by a perforated casing 39, having ears 40 at its sides to receive bolts ll extending therethrough and into the outer wall ot the back section 12.

The operation of the apparatus is as follows:

It. will be understood, of course, that the construction illustrating the heating apparatus is designed for use in. connection with a steam heating system, and that the said element 23 extends into the hollow rear section 12, and is in contact with the fluid therein. As the pressure of the fluid increases, due to the increase in temperature, it will cause the metallic bellows 23 to be contracted, and in so doing, move the rear end of the stem 27, secured to the end wall 23, outwardly, and cause the lower or free end of the lever 31 to move inwardly until the disc 33 seats upon I the ground surface 21 of the rib :21, and completely closes the opening 19, and thereby effectually prevents the further admission. of air to the ash-pit of the boiler. As a result, the fire will be checked, and with the checking of the fire, the temperature and pressure of the fluid will decrease and cause the metallic bellows again to expand under the influence of the spring 30, and gradually raise the disc 33 from its seat, and again permit the entering of fresh air through the opening 19.

Having thus described my said invention what I claim and desire to secure by Letters Patent is:

1. The combination of a boiler having an air supply inlet through a Vertical wall the-11eof independent ot' the ash-pit openin tor the admission to the boiler ot the main supply of air necessary to support combustion, with a closure for saidinlet, actuating means responsive to changes in condition within the boiler mounted on said vertical wall above said inlet, a s ,m for said actuating means e tei'iding outwardly therefrom substantially in iarallelism with the axis (it said inlet, a lever pivoted adjacent to one end at a point between said stem and said inlet and extending along wall from said actuating means towards said inlet; said lever at one end carrying said closure, and operatively connected at the opposite side of its pivot with said stem, and spring means for resisting movement of said actuatin means, and for holding said closure in open position, substantially as specifled.

2. The combination of a boiler having a main air inlet with a lever pivotally supported adjacent to its upper end, a closure for said air inlet carried by the free end of said lever, means responsive to changesin condition' within the boiler for automatically controlling the operation of said closure, a pivoted support, a member mounted upon said pivoted support adapted to move said closure to an adjusted position when said support is actuated, and means tor holding said member in position to limit the movement of said closure in the reverse direction substantially as specified.

3. The combination of a boiler having a main air inlet with a lever pivotally supported adjacent to its upper end having its opposite end free, a closure torsaid air inlet carried by the free end otsaid lever, thermoresponsive means for automatically controlling the movements of said closure with respect to said air inlet, a support pivotally mounted adjacent to said lever, a member on said support engaging said lever, and an-overbalanced member secured to said support serving, in one position, to hold said closure in position to seal said air inlet, and, in another position, to limit the outward movement of said closure substantially as specified.

a. The combination with a boiler having a main air inlet, and an opening in a wall portion communicating with the fluid space of the boiler, with a cover for said opening, a thermo-responsive element secured to said cover and extending into the boiler, a stem secured to a movable part of said thermo-responsive element and extending through said cover, a lever pivotallysecured at its upper end to said cover and operatively connected to the projecting end of said stem, a closure secured to the lower end of said lever and movable therewith towards and from said air inlet, a shaft supported transversely adjacent to the free end of said lever, a cam on said shaft. engaging said lever, and an overbalanced arm secured to'said shaft serving, in

one position, to hold said closure in position to seal said air inlet, and, in another position, to limit the outward movement of said closure, substantially as specified.

5. The combination of a boiler having a main air supply inlet, with a closure for said inlet, automatic means responsive to changes in condition within the boiler for controlling said closure, a member pivoted transversely of said automatic means, and movable towards said automatic means to actuate the same to control said closure independently of the automatic control thereof, and movable away from said automatic means to permit of the free operation thereof, and means for maintaining said pivoted member to its adjusted positions, substantially as specified.

6. The combination of a boiler having a main air supply inlet, with a closure for said inlet, automatic means responsive to conditions within the boiler for controlling said closure, a member pivoted transversely of said automatic means, and movable towards said automatic means to actuate the same to control said closure independently of the automatic control thereof, and movable away from said automatic means to permit of the free operation thereof, and a weighted arm secured to said member to maintain the same in each position when moved thereto, substantially as specified.

p 7. The combination of a boiler having a main air supply inlet, with a closure for said inlet, means responsive to conditions within the boiler for automatically controlling said closure, a removable protective covering enclosing said closure and said means, and a member pivotally carried by said covering for removal therewith, and movable towards and away from said automatic controlling means to actuate the same to control said closure, substantially as specified.

8. The combination of a boiler having an inlet in the side wall thereof independent of the ashpit opening for the admission to the boiler of the main supply of air necessary to support combustion, with an element responsive to changes in condition within the boiler disposed on said side wall, a closure for said inlet, a lever operatively connecting said element with said closure, a protective covering partially enclosing said parts, means within said covering for controlling said closure independently of the automatic operation thereof, and an actuating member for said last named means arranged outside of said covering, substantially as specified.

Signed at the city of New York, in the county and State of New York, this 17th day of February, one thousand nine hundred and twenty-three. I

ANDRE M. MERTZANOFF. 

